CN105717971A - Voltage regulator - Google Patents
Voltage regulator Download PDFInfo
- Publication number
- CN105717971A CN105717971A CN201510949695.2A CN201510949695A CN105717971A CN 105717971 A CN105717971 A CN 105717971A CN 201510949695 A CN201510949695 A CN 201510949695A CN 105717971 A CN105717971 A CN 105717971A
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- Prior art keywords
- voltage
- overshoot
- suppresses
- unit
- voltage regulator
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
Provided is a voltage regulator capable of applying an optimal overshoot suppression unit depending on states. The voltage regulator includes: an amplifier for controlling an output transistor based on a voltage obtained by amplifying a difference between a divided voltage and a reference voltage; a first overshoot suppression unit for controlling a gate voltage of the output transistor, to thereby suppress overshoot of the output voltage; a second overshoot suppression unit for controlling an operating current of the amplifier, to thereby suppress the overshoot of the output voltage; and a control circuit. The control circuit is configured to turn on the first overshoot suppression unit immediately after the voltage regulator is powered on, and turn off the first overshoot suppression unit under a state in which the output voltage is stable.
Description
Technical field
The present invention relates to the voltage regulator of the overshoot characteristics that can improve voltage regulator.
Background technology
As shown in Figure 4, existing voltage regulator is constituted by with lower part: voltage regulator control circuitry, it is made up of the amplifier 402 powered by current source 403, the reference voltage V REF of voltage source 401 is amplified by this amplifier 402 with the difference voltage of the voltage of the contact of the resistance 405,406 of the bleeder circuit formed voltage (following, the to be recited as VOUT) dividing potential drop of the lead-out terminal 407 of voltage regulator；Output transistor 404, the output voltage based on amplifier 402 controls；And overshoot suppresses unit 400, it is made up of resistance 411, capacitor 412 and transistor 413；Voltage regulator utilizes positive supply voltage (following, to be recited as VDD) to carry out action.
If setting the output voltage of amplifier 402 as the voltage of VERR, the contact of resistance 405,406 is VFB, then the VERR step-down when VREF > VFB, when VREF < VFB, VERR uprises on the contrary.
If VERR step-down, then the conducting resistance of output transistor 404 diminishes thus improving VOUT, and when contrary VERR uprises, the electric conduction resistive of output transistor 404 is big thus reducing VOUT as a result, become VREF=VFB, makes VOUT keep constant.
When energized, VOUT also relatively low, be in the state of VREF > VFB.Now, output transistor 404 is controlled so as to, for making conducting resistance step-down, therefore be susceptible to overshoot at VOUT.Therefore, in the certain period determined by the time constant of resistance 411 and capacitor 412, transistor 413 is carried out conducting control, thus controlling VERR at the voltage close to VDD.Thus, output transistor 404 is cut off control, therefore can seek the overshoot (for example, referring to patent documentation 1) suppressing VOUT.
Patent documentation 1: Japanese Unexamined Patent Publication 2004-252891 publication.
Summary of the invention
But, in the existing voltage regulator shown in Fig. 4, it is suppressed that during the overshoot of VOUT, transistor 413 can be cut off control, therefore connects in loaded situation at the lead-out terminal 407 of voltage regulator, it is possible at VOUT, undershoot occurs.
That is, the state according to supply voltage, load etc., it is necessary to best overshoot suppresses unit, but exist cannot the problem of corresponding such state for existing voltage regulator.
The present invention conceives for eliminating above such problem, it is provided that can apply the voltage regulator of the overshoot suppression unit of the best based on state.
In order to solve existing problem, the voltage regulator of the present invention adopts following structure.
This structure possesses: amplifier, controls output transistor by amplifying the voltage of branch pressure voltage and the difference of reference voltage；First overshoot suppresses unit, controls the grid voltage of output transistor and suppresses the overshoot of output voltage；Second overshoot suppresses unit, controls the action current of amplifier and suppresses the overshoot of output voltage；And control circuit, wherein, control circuit makes the first overshoot suppress unit conducting when power initiation, makes described first overshoot suppress unit cut-off when output voltage stabilization.
Voltage regulator according to the present invention, using the teaching of the invention it is possible to provide the voltage regulator of the overshoot suppression unit of the best can be applied based on state.
Accompanying drawing explanation
Fig. 1 is the explanation figure of the voltage regulator illustrating the 1st embodiment.
Fig. 2 is the explanation figure of other examples of the voltage regulator illustrating the 1st embodiment.
Fig. 3 is the explanation figure of the voltage regulator illustrating the 2nd embodiment.
Fig. 4 is the explanation figure illustrating existing voltage regulator.
Detailed description of the invention
Fig. 1 is the explanation figure of the voltage regulator illustrating the 1st embodiment.The voltage regulator of the 1st embodiment possesses: voltage source 401；Amplifier 402；Current source 403；Output transistor 404；Form the resistance 405,406 of bleeder circuit；Lead-out terminal 407；Overshoot suppresses unit 100；Overshoot suppresses unit 400；And control circuit 101.
Overshoot suppresses unit 100 to possess resistance 111, capacitor 112 and transistor 113.Overshoot suppresses unit 400 to possess resistance 411, capacitor 412 and transistor 413.
Resistance 111 and capacitor 112 are connected in series between positive supply voltage (following, to be recited as VDD) and negative supply voltage (following, to be recited as VSS).The drain electrode of transistor 113 and source electrode are connected with input terminal and the VSS of current source 403, and grid is connected with the junction point of resistance 111 and capacitor 112.
Resistance 411 and capacitor 412 are connected in series between VDD and VSS.The drain electrode of transistor 413 and source electrode are connected with the lead-out terminal of VDD and amplifier 402, and grid is connected with the junction point of resistance 411 and capacitor 412.
Voltage source 401 output reference voltage (following, to be recited as VREF).The voltage (following, to be recited as VOUT) of lead-out terminal 407 is carried out the voltage (following, to be recited as VFB) after dividing potential drop by bleeder circuit output.Amplifier 402 exports the result voltage after the difference of VREF and VFB being amplified (following, to be recited as VERR).Current source 403 flows out the action current of amplifier 402.Overshoot suppresses unit 100 to detect the variation of supply voltage and control the action current of amplifier 402.Overshoot suppresses unit 400 to detect the variation of supply voltage and control the grid of output transistor 404.In control circuit 101, the first lead-out terminal suppresses unit 100 to be connected with overshoot, and the second lead-out terminal suppresses unit 400 to be connected with overshoot, and each is carried out ON-OFF control.
Then, the action of the voltage regulator of the 1st embodiment is illustrated.Basic acts is identical with existing voltage regulator.
When energized, VOUT is also relatively low and be in the state of VREF > VFB.Now, output transistor 404 is controlled so as to, for making conducting resistance step-down, therefore be susceptible to overshoot at VOUT.Therefore, in the certain period determined by the time constant of resistance 411 and capacitor 412, transistor 413 is carried out conducting control, thus controlling VERR at the voltage close to VDD.Output transistor 404 is cut off control, therefore suppresses the overshoot of VOUT.That is, utilizing overshoot to suppress unit 400, controlling to suppress the overshoot of VOUT by output transistor 404 being carried out cut-off.
Under the state that the conducting resistance of output transistor 404 is relatively low when energized, the probability that overshoot occurs at VOUT is high.Owing to needing that rapidly transistor 413 is carried out overshoot suppression unit that cut-off controls in this condition, so the function that output transistor 404 is carried out the action that cut-off controls can be played, it is simply that the suitable overshoot based on state suppresses unit.
Then, become VREF=VFB and VOUT is maintained at given voltage usual state under, it is necessary to consider undershoot overshoot suppress unit.Therefore, in the certain period determined by the time constant of resistance 111 and capacitor 112, by transistor 113 being carried out conducting control, it is controlled in the way of making the action current increase of amplifier 402.Thereby, it is possible to amplifier 402 High-speed Control output transistor 404, so the overshoot of VOUT is inhibited.That is, overshoot is utilized to suppress unit 400, by being controlled in the way of making the increase of the action current of amplifier 402, it is suppressed that the overshoot of VOUT.
Under the usual state that VOUT is maintained at given voltage, if carrying out transistor 413 carries out the overshoot suppression action that cut-off controls, it is likely that at VOUT, undershoot occurs.In this state, it is necessary to the overshoot considering undershoot suppresses unit, therefore can play the function of the overshoot suppression action being controlled in the way of making the increase of the action current of amplifier 402, it is simply that the suitable overshoot based on state suppresses unit.
At this, control circuit 101 makes multiple overshoot suppress Unit selection ground function according to state.When the voltage regulator of the 1st embodiment, make when switching on power overshoot suppress unit 400 function, make overshoot suppress unit 100 function in the normal state.Method as these controls, for instance, possess the switch connected with transistor 413 or transistor 113, this switch is carried out ON-OFF control.Additionally such as possess the switch in parallel with resistance 411 or resistance 111, this switch is carried out ON-OFF control.
Additionally, control circuit 101 is controlled based on the size of the conducting resistance of output transistor 404.Thus, VREF > VFB, it is known that whether the conducting resistance of output transistor 404 is extremely low state, therefore, it is possible to make to suppress Unit selection ground function based on the suitable overshoot of state.The transistor such as possessing the relation in parallel with output transistor can be enumerated, it determines the method flowing through the amount of the size of current of this transistor.
It addition, control circuit 101 is controlled based on supply voltage.The voltage detector such as possessing the voltage monitoring power supply can be enumerated, and be determined as the method after switching on power with the output of this voltage detector.
It addition, control circuit 101 carries out action based on the voltage of VOUT.Can enumerate and such as possess the voltage detector monitoring VOUT, and be determined as the method after switching on power with the output of this voltage detector.
It addition, as long as overshoot suppresses unit 400 can carry out output transistor 404 carries out the action that cut-off controls, its structure is no need for being confined to foregoing circuit.Therefore, according to structure function carried out ON-OFF control, thus about playing the method for above-mentioned functions without doing any restriction.
As described above, in the voltage regulator of the 1st embodiment, using the teaching of the invention it is possible to provide the voltage regulator of the overshoot suppression unit of the best can be applied based on state.
Fig. 2 is the explanation figure of other examples of the voltage regulator illustrating the 1st embodiment.The voltage regulator of Fig. 2 possesses overshoot and suppresses unit 200 and control circuit 201.Overshoot suppresses unit 200 to possess resistance 211, capacitor 212 and transistor 213.
Resistance 211 and capacitor 212 are connected in series between VOUT and VSS.The drain electrode of transistor 213 and source electrode are connected with input terminal and the VSS of current source 403, and grid is connected with the junction point of resistance 211 and capacitor 212.
Overshoot suppresses unit 200 to detect the variation of VOUT and control the action current of amplifier 402.First lead-out terminal of control circuit 201 suppresses unit 100 to be connected with overshoot, and the second lead-out terminal suppresses unit 400 to be connected with overshoot, and the 3rd lead-out terminal suppresses unit 200 to be connected with overshoot, and each is carried out ON-OFF control.
Then, the action of the voltage regulator of Fig. 2 is illustrated.Except control and action that overshoot suppresses unit 200, identical with the voltage regulator of the 1st embodiment, therefore the description thereof will be omitted.
Overshoot suppresses unit 200 when VOUT change, in the certain period determined by the time constant of resistance 211 and capacitor 212, transistor 213 carries out conducting control, thus being controlled in the way of making the increase of the action current of amplifier 402.Thereby, it is possible to output transistor 404 is carried out High-speed Control by amplifier 402, therefore the overshoot of VOUT is inhibited.That is, utilize overshoot to suppress unit 200, by being controlled in the way of making the increase of the action current of amplifier 402, the overshoot of VOUT can be suppressed.
With switch on power or power supply variation is unrelated, under the usual state that VOUT is maintained at given voltage, be controlled in the way of making the action current increase of amplifier 402 when VOUT change, it is simply that the suitable overshoot based on state suppresses unit.
Fig. 3 is the explanation figure of the voltage regulator illustrating the 2nd embodiment.The voltage regulator of the 2nd embodiment possesses overshoot and suppresses unit 430 and control circuit 301.
Overshoot suppresses unit 430 to possess variable resistance 431, capacitor 412 and transistor 413.
Variable resistance 431 and capacitor 412 are connected in series between VDD and VSS.The drain electrode of transistor 413 and source electrode are connected with the lead-out terminal of VDD and amplifier 402, and grid is connected with the junction point of variable resistance 431 and capacitor 412.The lead-out terminal of control circuit 301 suppresses unit 430 to be connected with overshoot, controls variable resistance 431.
Then, the action of the voltage regulator of the 2nd embodiment is illustrated.Basic acts is identical with the voltage regulator of the 1st embodiment.
When energized, VOUT is also relatively low and be in the state of VREF > VFB.Now, output transistor 404 is controlled so as to, for making conducting resistance step-down, therefore be susceptible to overshoot at VOUT.Therefore, control circuit 301 by make variable resistance 431 resistance value become big in the way of finely tune.And, determined by the time constant of variable resistance 431 and capacitor 412 certain long-term between, by transistor 413 being carried out conducting control, VERR is controlled at the voltage close to VDD.Thus, output transistor 404 is cut off control, and therefore the overshoot of VOUT is inhibited.That is, utilizing overshoot to suppress unit 430, output transistor 404 being carried out cut-off control, thus suppressing the overshoot of VOUT.
Under the usual state that VOUT is maintained at given voltage, during VDD variation, it is necessary to the overshoot considering undershoot suppresses unit.Therefore, control circuit 301 is finely tuned in the way of making the resistance value of variable resistance 431 diminish.And, the certain period shorter when the ratio determined by the time constant of variable resistance 431 and capacitor 412 switches on power, by transistor 413 being carried out conducting control, VERR is controlled at the voltage close to VDD.By such control, shorten because transistor 413 is cut off period of control and has reached the overshoot of the undershoot considering VOUT and suppressed unit.
Even if suppressing unit 200 also to give play to the effect same with the voltage regulator of Fig. 2 additionally, the voltage regulator of the 2nd embodiment possesses overshoot.In the case, the second lead-out terminal of control circuit 301 suppresses unit 200 to be connected with overshoot, and carries out ON-OFF control.
As described above, according to the voltage regulator of the 2nd embodiment, using the teaching of the invention it is possible to provide the voltage regulator of the overshoot suppression unit of the best can be applied based on state.
Additionally, describe overshoot suppress unit 100 and overshoot suppress unit 400 based on the variation of supply voltage function, but these can also be configured to the variation based on output voltage and function.
It addition, overshoot suppresses unit 100 and overshoot to suppress unit 200, whichsoever or two not to be cut off the objective controlled without departing from the present application.
Label declaration
100,200,400,430 overshoot suppression circuit；
101,201,301 control circuit；
401 voltage sources；
402 amplifiers；
403 current sources.
Claims (4)
1. a voltage regulator, it is characterised in that possess:
Amplifier, according to the Control of Voltage output transistor after the difference of the branch pressure voltage after output voltage dividing potential drop Yu reference voltage being amplified；
First overshoot suppresses unit, controls the grid voltage of described output transistor and suppresses the overshoot of described output voltage；
Second overshoot suppresses unit, controls the action current of described amplifier and suppresses the overshoot of described output voltage；And
Control circuit, makes described first overshoot suppress unit conducting when the power source is activated, makes described first overshoot suppress unit cut-off when described output voltage stabilization.
2. voltage regulator as claimed in claim 1, it is characterised in that
Described second overshoot suppresses unit to possess:
First suppresses unit, the function based on startup or the variation of supply voltage；And
Second suppresses unit, the function based on the variation of described output voltage.
3. a voltage regulator, it is characterised in that possess:
Amplifier, according to the Control of Voltage output transistor after the difference of the branch pressure voltage after output voltage dividing potential drop Yu reference voltage being amplified；
First overshoot suppresses unit, has the variable resistance according to control signal convert resistance value, controls the grid voltage of described output transistor and suppresses the overshoot of described output voltage；And
Control circuit, increases described variable-resistance resistance value when the power source is activated, reduces described variable-resistance resistance value when described output voltage stabilization.
4. voltage regulator as claimed in claim 3, it is characterised in that
Described voltage regulator is also equipped with:
Second overshoot suppresses unit, controls the action current of described amplifier and suppresses the overshoot of described output voltage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-256851 | 2014-12-19 | ||
| JP2014256851A JP6513943B2 (en) | 2014-12-19 | 2014-12-19 | Voltage regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105717971A true CN105717971A (en) | 2016-06-29 |
| CN105717971B CN105717971B (en) | 2018-11-09 |
Family
ID=56130600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510949695.2A Expired - Fee Related CN105717971B (en) | 2014-12-19 | 2015-12-18 | Voltage regulator |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US9671802B2 (en) |
| JP (1) | JP6513943B2 (en) |
| KR (1) | KR102335295B1 (en) |
| CN (1) | CN105717971B (en) |
| TW (1) | TWI665542B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107872052A (en) * | 2016-09-26 | 2018-04-03 | 马克西姆综合产品公司 | The system and method suppressed for output voltage overshoot |
| CN110391588A (en) * | 2018-04-23 | 2019-10-29 | 日亚化学工业株式会社 | Driving circuit and processing unit |
| CN112667018A (en) * | 2020-12-14 | 2021-04-16 | 思瑞浦微电子科技（苏州）股份有限公司 | Power supply electrifying overshoot-prevention circuit based on LDO (Low dropout regulator) |
| CN112947661A (en) * | 2021-02-12 | 2021-06-11 | 上海韦玏微电子有限公司 | Quick power-on voltage stabilizer circuit and method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7031983B2 (en) * | 2018-03-27 | 2022-03-08 | エイブリック株式会社 | Voltage regulator |
| CN114583676B (en) * | 2022-03-29 | 2023-09-12 | 拓尔微电子股份有限公司 | Circuit and method for reducing LDO output voltage overshoot |
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| JP2015001771A (en) * | 2013-06-13 | 2015-01-05 | セイコーインスツル株式会社 | Voltage regulator |
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2014
- 2014-12-19 JP JP2014256851A patent/JP6513943B2/en active Active
-
2015
- 2015-12-07 TW TW104140876A patent/TWI665542B/en not_active IP Right Cessation
- 2015-12-11 KR KR1020150177039A patent/KR102335295B1/en active IP Right Grant
- 2015-12-14 US US14/968,129 patent/US9671802B2/en active Active
- 2015-12-18 CN CN201510949695.2A patent/CN105717971B/en not_active Expired - Fee Related
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| JP2004252891A (en) * | 2003-02-21 | 2004-09-09 | Mitsumi Electric Co Ltd | Regulator circuit |
| WO2014038284A1 (en) * | 2012-09-07 | 2014-03-13 | セイコーインスツル株式会社 | Voltage regulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107872052A (en) * | 2016-09-26 | 2018-04-03 | 马克西姆综合产品公司 | The system and method suppressed for output voltage overshoot |
| CN107872052B (en) * | 2016-09-26 | 2021-08-24 | 马克西姆综合产品公司 | System and method for output voltage overshoot suppression |
| CN110391588A (en) * | 2018-04-23 | 2019-10-29 | 日亚化学工业株式会社 | Driving circuit and processing unit |
| CN110391588B (en) * | 2018-04-23 | 2023-12-12 | 日亚化学工业株式会社 | Drive circuit and processing device |
| CN112667018A (en) * | 2020-12-14 | 2021-04-16 | 思瑞浦微电子科技（苏州）股份有限公司 | Power supply electrifying overshoot-prevention circuit based on LDO (Low dropout regulator) |
| CN112667018B (en) * | 2020-12-14 | 2022-12-02 | 思瑞浦微电子科技（苏州）股份有限公司 | Power supply electrifying overshoot-prevention circuit based on LDO (Low dropout regulator) |
| CN112947661A (en) * | 2021-02-12 | 2021-06-11 | 上海韦玏微电子有限公司 | Quick power-on voltage stabilizer circuit and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105717971B (en) | 2018-11-09 |
| US9671802B2 (en) | 2017-06-06 |
| KR102335295B1 (en) | 2021-12-03 |
| JP6513943B2 (en) | 2019-05-15 |
| KR20160075329A (en) | 2016-06-29 |
| US20160181924A1 (en) | 2016-06-23 |
| TW201633031A (en) | 2016-09-16 |
| JP2016118840A (en) | 2016-06-30 |
| TWI665542B (en) | 2019-07-11 |
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